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Hi @chaipibeta, Thank you for your question! While I'm not certain about the effectiveness of flavor oils, I can confirm that the other two options you mentioned should work for your intended use. That being said, I would like to recommend our coffee and tea flavorings which are specifically designed to enhance the flavor of your tea and coffee. You can find more information about our product at www.naturesflavors.com/search?utf8=%E2%9C%93&keywords=coffee+and+tea+flavorings. Additionally, we have a video tutorial available on our RU-vid channel which you may find helpful. You can watch it at ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vCY-m4fMs8g.html. I hope this information proves useful to you. Let me know if you have any further questions or concerns.